Specifications

7193 Owner’s Guide Chapter 5: Communication
August 1998 35
The next table shows that with no delay between lines, the transmit time is much less than
the print time, allowing the printer to print at full speed.
Characters/Line Lines/Receipt Transmit Time:
(9600 Baud)
Transmit Time: (19.2
K Baud)
Print Time
20 20 0.4 Seconds 0.2 Seconds 1.2 Seconds
20 40 0.8 Seconds 0.4 Seconds 2.4 Seconds
44 20 0.88 Seconds 0.44 Seconds 1.2 Seconds
44 40 1.76 Seconds 0.88 Seconds 2.4 Seconds
XON/XOFF Protocol
The XON/XOFF characters coordinate the information transfer between the printer and
the host computer. The printer sends an XON character when it is ready to receive data
and it sends an XOFF character when it cannot accept any more data. The software on the
host computer must monitor the communication link as shown in the following flowchart
in order to send data at the appropriate times.
If XON/XOFF has been selected, the printer also toggles the DTR signal, as described in
the next section, but it does not look at the DSR signal to transmit data.
XON character = hexadecimal 11.
XOFF character = hexadecimal 13.
DTR/DSR Protocol
The DTR signal is used to control data transmission to the printer. It is driven low when
the printer is ready to recieve data and driven high when it cannot accept any more data.
Data is transmitted from the printer after it confirms that the DSR signal is low.